I was thinking the same thing, except that I could have a friend fly up for something else and come see me. They might not have their kit if they flew up with just carry on (no lighters, no knives) and they just might not have expected to go on a hike. That said, I didn't include a knife because I don't see it as vital to survival if they're just spending the night out. Better to give them a blanket then a knife.